For the first time it was given the general characteristics of the synanthropic flora of Ukraine. It was revealed that synanthropic fraction of the brioflora consists of apophytic species only, the adventive species in the brioflora are absent. 68 species hemiapophytes, 75 – eventapophytes, the evapophytes are not dislayed. The synantropic fraction of the Ukrainian bryoflora includes 143 species, representatives of 56 genus 19 families. In general mosses poorly acclimatize anthropogenic ecotopes. The level of synanthropization of the moss flora of Ukraine in comparison with vegetation flora is unimportant – 24.1%. The most of the mosses are indigenophytes (447 species – 75.9%), they grow in nature ecotopes, so owing to intensive destruction of such ecotopes many species became rare and endangered.

It is presented a synanthropic flora’s review of 24 intrazonal vegetation classes, which numbers 273 species of vascular plants in the Nothern Black Sea Region. Systematical, biomorphologic, geographic, ecological analysis have been carried out. The flora and vegetation change forecast was done depending on an influence of economical factors, some questions of there’s optimization and next researches problems have been reviewed.

Critical review of classification of weed vegetation of crops cultures of the Crimea is presented. It includes 19 associations, 8 alliances, 4 orders of class Stellarietea mediae according to Braun-Blanquet system. Phytocoenological characteristic of syntaxons, their diagnostical species have been revealed. The features of zonal distributional of communities in various agrocoenoses are considered.

The materials of the dominant species and the state of the artificial wood investigation in the conditions of the south steppe zone of Ukraine (Kherson and Mykolaiv regions) are given in the article. It is shown that the best forest species for artificial woods is Gleditsia triacanthos L. The trees of this species in comparison with other species are more high, better take root, grow faster, have less fall, decorative, melliferous, rarely subject to infection and vermin, long-term, especially when the density of trees meet the biological potential of the species. In the zone of chestnut soils G. triacantos is the only species able to create field-protective plantation.

The results of investigation of biomorfological and economically valuable characteristics of six species of genus Origanum L. in conditions of a Southern coast of Crimea are summed up. High-productive forms have been recommended to cultivation in the south of Ukraine and apply in food industry and in medicine.

The alien fraction of the Mykolayiv urban flora includes 235 species, which are composed 25.8% of the total species number of the studied flora. Geographic range 28 groups are combined in eight migroelements of the flora. They are: Mediterranean migroelement – 48 species, Mediterranean Irano-Turanian – 42, North American – 37. Four species are of anthropogenic origin. Primary areas of distribution were not considered for five species. All alien species are distributed between three migrochronoelements by their period of immigration. They are archeophytes (immigrated before the 15th century) – 77 species, kenophytes (immigrated during the 16 – 19th centuries) – 69, and eukenophytes (immigrated in the 20th century) – 89.

The bryophyte flora of the NNP “Desnyansko-Starohutsky” ( the Sumy region, NE Ukraine) includes 102 species of 56 genera, 34 families belonging to two divisions: Marchantiophyta (9 spp.) and Bryophyta (93 spp.). Among them Brachythecium reflexum (Starke) B.S.G. and B. starkei (Brid.) B.S.G. are new for the whole Ukrainian Polissya, Calypogeia neesiana (Mass. et Carest.) K.Mull. and Orthotrichum diaphanum Brid. – new for the Left Bank Ukrainian Polissya; a number of the others are rare ones for the mentioned territories.

The resultes of the species investigations and its preading in Ukraine – all the locations known from the literature and herbarium material and the new location are given. The ecologycal and coenotyc peculiarities and desciption history of the Cymbochasma borysthenica are given. In all the coenoses it has low level association with turf grass. For protection of this rare species it was proposed to create nature reserves in its all known location in Kherson and Mykolajiv region.